• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.42-49
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• 2022

In recent years, Owner, Architects, and Contractor are increasingly collaborating with each other from pre construction phase in construction projects, which is called Early Contractor Involvement (ECI). In Japan, the ECI method has been introduced in several public building projects since 2015. The purpose of this study is mainly to clarify the characteristics of the ECI method in Japan and to compare the contract clauses of the ECI method in the UK and the USA. The results of the survey are as follows. (1) the ECI method was supposed to make it possible to achieve appropriate quality, cost, and construction period by reflecting Contractor's technology and know-how in the design documents and specifications. (2) According to the database, there were 27 cases of the ECI method in Japan from 2015 to 2021, of which 13 cases for which bidding information could be obtained had a variety of technical proposals, mainly VE proposals, depending on the project characteristics. (3), Japan's ECI method has very much in common with SBC + PCSA in the UK. On the other hand, ECI Method in Japan differs from in the UK in that Owner, Architect, and Contractor enter into a partnership agreement, which is similar to ConsensusDocs CD541 in the USA. (4) The ECI method in Japan has the following problems: Owner depends on Contractor for cost control, the division of roles among project members is complicated, and more work from Owner than the DBB method are required.

• Journal of Construction Engineering and Project Management
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• 제2권1호
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• pp.27-34
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• 2012

Recent requirements in component management of building systems have focused on the requirement for improving methods and metric tools to support component condition assessment and appropriate decisions for infrastructure owned facilities. Although engineers and researchers have focused on developing methodologies for component assessment in recent years but there is not enough attention dedicate to facilities and components that have been constructed. This paper is a literature study of scientific papers within the topic of component condition index system (CCIS) in the period 1976 to 2009. Infrastructure component condition index had existed for some 40 years. The purpose of this paper is to provide an overview of CCIS to identify the suitable method for component condition assessment during its service life. This paper finds that the focus of CCIS, surveyed in several aspects during the 40 years that have been investigated, from technology to measurement and from assessment function to component maintenance as an integrated part of the infrastructure component management. This study offers help to researchers in understanding the selection of an appropriate method for component condition assessment in building and non-building systems.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1999년도 봄 학술발표회 논문집
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• pp.455-462
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• 1999

In this case, we have selected a representative location in the vicinity of large underground structures where they cross a runway and taxiway: measured the effects of the dynamic hammer compaction by distance: analyzed the measured results over a period of time and for many frequencies: and determined the maximum anticipated particle velocity (PV) of vibration, caused by the dynamic hammer, verses distance. In addition, while compacting the hydrofill, we reviewed the impact of subsurface particle velocities, caused by hammer compaction methods, upon newly constructed reinforced concrete underground structures. We have implemented the appropriate technical standards after reviewing domestic and international technical standards concerning allowable vibration velocity appropriate In the many types of underground structures at Inchon International Airport.

• 한국지진공학회논문집
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• 제16권6호
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• pp.29-36
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• 2012

Involved in a research for the application of seismic isolation to the nuclear industry, this study evaluates firstly the responses of seismic isolation system considering general ranges of structural period and damping ratio by using preliminary design formula. Secondly, coupling effects of input motions were evaluated to find out appropriate conditions of excitations and effect of the iteration for calculating yield displacement of lead core was also assessed in terms of response of a seismically isolated structure. Finally, the results of preliminary design calculation were compared with those of dynamic analysis and the propriety of the formula was evaluated and appropriate ranges of reduction factor were also suggested from the results.

• The Journal of Asian Finance, Economics and Business
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• 제9권9호
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• pp.93-104
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• 2022

This study aims to investigate the factors that contribute to the sustainable development of 334 Vietnamese construction and real estate companies listed on the Stock Exchange of Vietnam over a 5-year period from 2016 to 2020. By using regression analysis with the support of STATA software through examining the financial statements, which involves looking into crucial ratios including capital structure, profitability, firm size, accounts receivable management, and tangible assets investment, this study sheds light on whether these accounting indicators could help predict the construction and real estate companies growing potential in the future. Nevertheless, these ratios slightly contribute to the explanation of the change in revenue growth ratio, with a result of 1.6%, indicating that the value relevance of accounting information provides a modest and insignificant effect on investment decisions. This is understandable because the Vietnamese construction and real estate market still has many shortcomings in handling unexpected events, as well as the industry's peculiarities related to major capital sources from bank loans. Based on this study, governmental authorities and business executives should plan appropriate risk management policies and measures to contribute to the sustainable development of construction and real estate companies.

• 한국구조물진단유지관리공학회 논문집
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• 제16권2호
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• pp.31-39
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• 2012

최근 교량의 신설 및 교체 공사 중 요구되고 있는 교통 혼잡의 최소화, 환경 영향의 최소화, 공사기간의 단축, 품질과 시공성 향상 등을 위해 조립식 교량 시스템의 적용이 시대적 요구로 대두되고 있다. 조립식 교량 시공 중 거더 간의 연결 시 발생할 수 있는 전도 및 추락 사고는 교량 시스템에 적합한 가로보의 사용으로 해결이 가능할 것으로 보여 진다. 본 연구에서는 가로보의 구조적 특성을 조사하고 국내 외 적용현황을 분석하여 조립식 PSC T형 거더 교량에 접합한 가로보 대안을 설정하여 가로보 연결부의 특성을 규명하고자 실험체를 제작하여 정적 하중 재하실험을 실시하였다. 정적 하중 실험을 통하여 실험체의 접합부의 거동과 하중분배에 대해 살피고 실험결과를 비교, 분석하였고 실험을 통한 구조 성능의 결과 치, 시공성을 고려하여 조립식 PSC T형 거더 교량에 접합한 가로보 대안을 제안 하였다.

• 대한안전경영과학회지
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• 제25권3호
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• pp.31-36
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• 2023

The use of hanging scaffolding for exterior wall painting and cleaning in building construction and maintenance carries the inherent risk of fall accidents. While periodic rope replacement is crucial for preventing accidents resulting from rope breakage, current regulations lack specificity in determining appropriate disposal period for fiber ropes. This study analyzed the tensile strength of the most commonly used PP fiber ropes with different diameters (16 mm, 20 mm) in the domestic construction industry. Additionally, the effect of outdoor exposure was examined by measuring the tensile strength of new ropes and ropes exposing to outdoor conditions for 30 days and 90 days. The results showed that the new ropes and those exposed to outdoor for 30 days met the KS (Korean Standards) criteria for tensile strength. However, a significant decrease in tensile strength was observed in ropes exposed to outdoor for 90 days compared to both the new ropes and those exposed for 30 days. Furthermore, the ropes exposed for 90 days did not meet the KS criteria. These findings indicate the degradation of PP fiber ropes due to UV (Ultra Violet) radiation, highlighting the importance of considering this factor when determining the replacement period for fiber ropes used in scaffolding work.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2006년도 정기학술발표대회 논문집
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• pp.448-452
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• 2006

리모델링은 기존 건물을 폐기하지 않고 재활용 함으로써 자원의 재활용이라는 측면과 신축과 같은 부가가치를 창출한다는 측면에서 매우 중요하다고 할 수 있다. 그리고 공사에 적절한 공법 선정은 공사비와 공사기간을 줄여주고 품질을 향상시키는 역할을 한다. 또한 리모델링 공사의 경우 현장의 특성과 구조체의 특성이 공사시에 큰 영향을 끼치기 때문에 기존 신축공사 보다 공법선정이 매우 중요하다고 할 수 있다. 그러나 현재의 공법 선정은 시공정보를 반영하지 않고 단지 기존에 주로 사용하던 공법만을 선정하고 있다. 그렇기 때문에 본 연구에서는 공법 선정시 의사결정을 도와주기 위한 tool의 구축 방안을 제안한다.

• 소음진동
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• 제11권1호
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• pp.104-110
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• 2001

The demand of blasting work in civil engineering work is increasing because of the increasing social infra-structural construction work. The blasting method creates large benefit in regard to the economic aspect and shortening construction period. This method, however, has problems to be solved in respect to the blasting vibration and noise. Blasting vibration and noise have been studied by many workers, regarding to the impact on the structure and human body. This investigation is concerned on the affect of blasting vibration and noise on the animals which is relatively new. In general, animals have inferior mental capacity than human in hearing but have higher sensitivity on the vibration and noise due to blasting. The object of this study is to investigate an appropriate measurement of lessening damage on the animals by vibration and noise due to blasting.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2008년도 춘계학술발표대회 논문집
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• pp.285-290
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• 2008

Recently, the scale of the construction work has been increased due to the revitalization of the construction industries. therefore, the demolition work in downtown areas is increased too. Amelioration districts are deteriorating rapidly since it followed the policy which allowed a large number of constructions in a very short period of time. therefore, the quantity of construction wastes and the designated wastes such as asbestos are increased. This study was classifying and analyzing the constructions in amelioration districts to estimate quantity of the designated wastes and the unit of the designated wastes. According to the results of this research, the average annual designated wastes was increased up to 2.59% in comparison with 2,779,334 ton in 2000, there came out 3,151,653 ton of designated wastes in 2005. For the appropriate disposal of increasing designated wastes, it is necessary to study exact estimation of the quantity of wastes.